It’s tough working in the dark on a Mac. The screen can blind you in the dark, and while apps like Flux make it easier on the eyes, it’s not enough.

Tranquility is a new app that sits in your menu bar and allows you to instantly switch to a dark, monochrome theme — something like iOS 7’s night mode. Unlike OS X”s built-in accessibility feature allowing you to invert colors, you can change the color pallette, go straight monochrome, adjust shadows and more.

If you’re a night owl, Tranquility is pretty great, and best yet, it’s free. Download it at the link below.